Stephenson o' da WEEK! (and bonus funpack comix)
From the mighty Cryptonomicon:

Men who believe that they are accomplishing something by speaking speak in a different way from men who believe that speaking is a waste of time. Bobby Shaftoe has learned most of his practical knowledge--how to fix a car, butcher a deer, throw a spiral, talk to a lady, kill a Nip--from the latter type of man. For them, trying to do anything by talking is like trying to pound in a nail with a screwdirver. Sometimes you can even see the desperation spread over such a man's face as he listens to himself speak.

Men of the other type--the ones who use speech as a tool of their work, who are confident and fluent--aren't necessarily more intelligent, or even more educated. It took Shaftoe a long time to figure that out.

[After meeting Enoch Root and Lawrence Waterhouse, Shaftoe] began to suspect that there might be a third category of man, a kind so rare that Shaftoe never met any of them until now.

Shaftoe has had little direct contact with that Waterhouse fellow during their stay on Qwghlm, but he has noticed that men who have just finished talking to Waterhouse tend to walk away shaking their heads--and not in the slow way of a man saying "no", but in the sudden convulsive way of a dog who has a horsefly in his middle ear...[Waterhouse] speaks, not as a way of telling you a bunch of stuff he's already figured out, but as a way of making up a bunch of new shit as he goes along. And he always seems to be hoping you'll join in.

Which no one ever does, except for Enoch Root.